AOC 4Vn Pincushion problem function buttons ain't working

I've got 3 monitors with pincushion problem and the front function button for pincushion doesn't work,function buttons work for brightness,contrast and other functions but not on pincushion adjustment...all 3 got the same problem but can't seem to find the problematic component..can anybody help me with this one..

thanks in advance..

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